(Answered) A survey of a random sample of 1000 smartphone owners found

Economics

A survey of a random sample of 1000 smartphone owners found that the mean daily time spent communicating on a smartphone was 131.4 minutes. From previous studies, it is assumed that the population standard deviation is 21.2 minutes. Communicating on a smartphone includes text, email, social media, and phone calls.

Can anyone find the 99% confidence interval for this? Be sure to include your inputs!

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